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Meet OpenMythos: An Open-Source PyTorch Reconstruction of Claude Mythos Where 770M Parameters Match a 1.3B Transformer

MarkTechPost / 4/20/2026

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Key Points

  • OpenMythos is an open-source GitHub project that tries to reconstruct the likely architecture behind Anthropic’s “Claude Mythos,” despite Anthropic not publishing a technical paper on it.
  • The project is implemented entirely in PyTorch and aims to be a first-principles, theory-driven approximation of the model’s design.
  • The reconstruction targets a parameter regime of about 770M, with results reportedly matching the behavior or capacity of a much larger 1.3B-parameter transformer.
  • By grounding the effort in peer-reviewed work and sharing code publicly, OpenMythos provides a basis for the research community to test hypotheses about the Mythos-style architecture.

Anthropic has never published a technical paper on Claude Mythos. That has not stopped the research community from theorizing. A new open-source project called OpenMythos, released on GitHub by Kye Gomez, attempts something ambitious: a first-principles theoretical reconstruction of what the Claude Mythos architecture might actually be, built entirely in PyTorch and grounded in peer-reviewed […]

The post Meet OpenMythos: An Open-Source PyTorch Reconstruction of Claude Mythos Where 770M Parameters Match a 1.3B Transformer appeared first on MarkTechPost.

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